Lung disease: Lung cancer Interstitial lung disease Suppurative lung disease Mesothelioma of the pleura Arteriovenous fistula or malformation Late TB Heart disease: Congenital cyanotic heart disease Subacute bacterial endocarditis Atrial myxoma (benign tumor) Tetralogy of Fallot Gastrointestinal and hepatobiliary: Crohn's disease ulcerative colitis Cirrhosis Hepatopulmonary syndrome Others:Graves disesase